Combined marine knotmeter, log and depth sounder



FIG. 1 is a front elevational view of a combined marine knotmeter, log and depth sounder showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a side elevational view thereof. 

The ornamental design for a combined marine knotmeter, log and depth sounder, as shown. 